| Silurian Reef | The Field Museum

Taxon Name: Ptychocrinus

Kingdom: Animalia

Phylum: Echinodermata

Subphylum: Crinozoa

Class: Crinoidea

Genus: Ptychocrinus

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Basic Geology Concepts
Biodiversity
Environmental Relations
Geologic history of Northeastern Illinois and Southeastern Wisconsin
Inside the Museum
Reefs
- The geologic record of reefs on Earth
- Types of reef organisms
Silurian Reef organisms
Silurian Reefs in the Field
The Fate of Reefs
The Silurian World
References